Create kustomization.yaml

Creating a kustomization.yaml file will allow awx-operator to be added as a remote resource in a Kustomize deployment.
e.g. :
```
resources:
- https://github.com/ansible/awx-operator/deploy?ref=0.7.0
```

deploy/kustomization.yaml

@@ -0,0 +1,4 @@
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+resources:
+- ./awx-operator.yaml